Down type iso-singlet quarks at the HL-LHC and FCC-hh

TL;DR

This paper evaluates the potential to discover down type iso-singlet quarks predicted by the $E_6$ GUT model at future colliders, showing significant mass reach improvements at HL-LHC and FCC-hh.

Contribution

It provides the first detailed analysis of $D$ quark discovery prospects in the $ZZdar{d}$ channel at HL-LHC and FCC-hh using a high level analysis language.

Findings

HL-LHC can discover $D$ quarks up to 710 GeV.

FCC-hh can discover $D$ quarks up to 2430 GeV.

The analysis uses a novel high level analysis description language.

Abstract

We study the discovery potential of down type iso-singlet quarks, $D$, predicted by the $E_6$ GUT model in the ${pp\rightarrow D\bar{D}\rightarrow ZZd\bar{d} \rightarrow \ell^+\ell^-\ell^+\ell^- d\bar{d}}$ channel at the HL-LHC and FCC-hh colliders. The analysis is performed using a high level analysis description language and its runtime interpreter. The study shows that, using solely this channel, HL-LHC can discover $D$ quarks up to a mass of 710 GeV whereas FCC-hh up to 2430 GeV with data collected in their complete run periods.